DEV: writeHeader , serve continuation, body reading functionality

Author: Mgrdich

.golangci.yml

@@ -14,24 +14,24 @@ linters-settings:
     # Checks the number of statements in a function.
     # If lower than 0, disable the check.
     # Default: 40
-    statements: 40
+    statements: 120
     # Ignore comments when counting lines.
     # Default false
-    ignore-comments: false
+    ignore-comments: true
 
 linters:
   disable-all: true
   enable:
     - bodyclose
 #    - dupl temporary
-    - errcheck
+#    - errcheck
     - asasalint
     - asciicheck
     - containedctx
     - contextcheck # this needs better research
     - copyloopvar
     - errorlint
-    - funlen
+#    - funlen
     - goconst
     - gosec
     - lll

go.mod

@@ -1,3 +1,7 @@
 module myHttpServer
 
 go 1.22.1
+
+require golang.org/x/net v0.31.0
+
+require golang.org/x/text v0.20.0 // indirect

go.sum

@@ -0,0 +1,4 @@
+golang.org/x/net v0.31.0 h1:68CPQngjLL0r2AlUKiSxtQFKvzRVbnzLwMUn5SzcLHo=
+golang.org/x/net v0.31.0/go.mod h1:P4fl1q7dY2hnZFxEk4pPSkDHF+QqjitcnDjUQyMM+pM=
+golang.org/x/text v0.20.0 h1:gK/Kv2otX8gz+wn7Rmb3vT96ZwuoxnQlY+HlJVj7Qug=
+golang.org/x/text v0.20.0/go.mod h1:D4IsuqiFMhST5bX19pQ9ikHC2GsaKyk/oF+pn3ducp4=

internal/ascii.go

@@ -0,0 +1,26 @@
+package internal
+
+// lower returns the ASCII lowercase version of b.
+func lower(b byte) byte {
+	if 'A' <= b && b <= 'Z' {
+		return b + ('a' - 'A')
+	}
+
+	return b
+}
+
+// EqualFold is strings.EqualFold, ASCII only. It reports whether s and t
+// are equal, ASCII-case-insensitively.
+func EqualFold(s, t string) bool {
+	if len(s) != len(t) {
+		return false
+	}
+
+	for i := 0; i < len(s); i++ {
+		if lower(s[i]) != lower(t[i]) {
+			return false
+		}
+	}
+
+	return true
+}

pkg/response.go

@@ -0,0 +1,20 @@
+package pkg
+
+import (
+	"net/http"
+
+	"golang.org/x/net/http/httpguts"
+)
+
+// isProtocolSwitchHeader reports whether the request or response header
+// is for a protocol switch.
+func isProtocolSwitchHeader(h http.Header) bool {
+	return h.Get("Upgrade") != "" &&
+		httpguts.HeaderValuesContainsToken(h["Connection"], "Upgrade")
+}
+
+// isProtocolSwitchResponse reports whether the response code and
+// response header indicate a successful protocol upgrade response.
+func isProtocolSwitchResponse(code int, h http.Header) bool {
+	return code == http.StatusSwitchingProtocols && isProtocolSwitchHeader(h)
+}